#show_img:before{
    content: "点击查看原图";
    background-color: rgba(0,0,0,0.4);
    width: 100px;
    height: 100%;
    position: absolute;
    left: 0;
    right: 0;
    margin: 0 auto;
    color: #fff;
    font-size: 12px;
}
.like{
    color: red;
    font-weight: bold
}